Improvement in spark-arresters



N4 PETERS. PHOTO-UYMOGRAPNER, WASHINGTON, D -C.

" UNITED .STATES PATENT OFFICE.

JAMES MONTGOMERY, OF IVASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN SPARK-ARRESTERS.

Specification forming part of Letters Patent No. 4,921 dated January *7,i847.

To all whom t may concern:

Be it known that I, JAMES MONTGOMERY, of the city and county ofVashington, and District of Columbia, have invented a new and usefulImprovement for Aaresting and Consuming Sparks and Creating ArtificialDraft; and I do hereby declare that the following is a full and exactdescription of the same,

reference being had to the annexed drawings,

making part of this specification, in which- Figure lis a section ofalocomotive-boiler; Fig. 2, plan of the top of the chimney, showing alsothe perforated .casing and shield; Fig. 3, a bottom view of the screwand revolving plate; Il`ig. 4, aplan of the wheel.

The same letters indicate like parts in all the figures.

In the accompanying drawings, a represents a revolving screw having twoor morey arms, as may be desired, placed at the top of the chimney t,the screw being made to `revolve by means of the waste steam which isthrown from steam-pipe d against the wheel b, thereby imparting a.rotary motion to the screw-fan a and h, which is attached io andrevolves with it, the object of the plate 7L, which covers the top ofthe casingf, being to prevent the air from entering the top of thechimney, and also to prevent the air from passing between the screw-fanand the revolving plate h, thereby producing an effectual exhaustion ofthe stack and at the same time economizing the power required to drivethe screw-fan.

I can use the common fan for the purpose within described; but I am wellassured that the screw-fan will be found best. I do Vnot confine myselfto the within-described method of driving my screw-fan..

I propose sometimes to use an uprightshaft, as represented in Fig. l,passing downward through the center of the chimney, to which I attach anauxiliary engine or other analogous device. The screw in this case beingpoised upon a spindle c, the socket is shown at Z and issupported by aniron bar placed at the top of the chimney, as shown at n. When the screwa is in motion, the smoke and sparks are thrown off in a lateraldirection through a trunk m or tube e, fitted to a perforated casing f,said casing being permanently fastened on the outside of the chimney atthe top. The tube or trunk e leads thence to the furnace m, into whichit discharges the sparks, the sparks being consumed in the furnace, andthe gases which are forced into the furnace through the tube e by thecentrifugal action of the screw-fan act to produce an economy of fuel.

g is a valve placed in said tube e to regulate the amount of gas thatshall be admitted from the chimney to the furnace.

The object of the perforated casing f, as d shown in' the drawings, isto prevent the escape of 'sparks that-rise from the chimney, as also toallow a portion of the smoke and gas to escape, a large part of thesmoke being conducted with the sparks, as already described, into thefurnace and there consumed by reason of its being made to pass over theburning fuel, together with the leakage of air from the furnace-doors.7c is also edge views of Figs. I and 2 of asemicircular shield thatextends down to the bottom of the perforated casing f, the object beingto prevent the gases and smoke from annoying the engineer, duc. I alsopropose using this arrangement of Vmachinery in the manufacture of ironfor returning the heat, smoke, and gases through the furnace over theores, metals, &c.,thereby producing' a great economy in the manufactureof iron. I intend sometimes to conduct the trunk or tube carrying thesparks, smoke, tbc., into the wheel-house of paddle-wheel Steamers insuch a manner that the paddlewheel in revolving will co-operate with thescrew-fan in exhausting the tube of its contents. p

It is obvious that the Within-descril ed machine will be useful forventilation and many other purposes.

Vhat I claim as my invention, and desire to secure by Letters Patent,is-

l. The mode herein described of creating draft in chimney-stacks byneans of the screw-fana, attached to the plate 7L, placed at the top ofthe stack, substantially in the manner described.

2. The above, in combination with the perforated casing f and shield la,and in combination therewith the tube or trunk e and valve g, placedwithin it, all in the manner and for the purpose described.

JAS. MONTGOMERY. IVitnesses: y

J. J. GEEENOUGH, A. P. BROWNE.

